Get ready to have your mind completely blown! This Optical Illusions & Visual Oddities II Playing Cards deck packs 55 mind-bending optical illusions into one colorful, pocket-sized package. Each 2.5" x 3.5" card features a different visual trick that'll make you question what you're actually seeing—and the best part is the included instruction booklet by J.R. Block, PhD, who breaks down the science behind each illusion. Whether you're fascinating friends at parties, teaching kids about how our brains process visual information, or just enjoying some solo "wait, how does that work?" moments, this deck delivers endless entertainment. Perfect for psychology students, teachers, anyone who loves brain teasers, or people who just enjoy having their perception challenged. Fair warning: you might find yourself staring at these cards way longer than you planned, trying to figure out exactly what's happening to your eyeballs.